Abstract Spatial and temporal variability of stream total phosphorus (TP) concentrations and loadings was evaluated over a year in a high‐country agricultural catchment. One storm event was also sampled at the inflow to a lake. An upland tributary had the highest median concentration (0.064 mg 1‐1), but the maximum (0.614 mg 1‐1) occurred at the inflow during the storm. Values near the lake surface were low but increased with depth in summer. There was a large difference between two streams, and values exceeded water quality guidelines in several locations. Seasonality in concentrations was not evident. Mean and median loadings at the inflow were approximately 7000 and 680 g day‐1, respectively, and the maximum was 81 540 g day‐1during the storm. TP loadings to the lake during a synoptic survey were 470 g day‐1 or 13 g km‐2day‐1. The lower half of the catchment contributed 72% of the loading to the lake. Baseflow, snowmelt, and one storm accounted for 47%, 30%, and 23%, respectively, of the total annual l...
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机译：摘要在一个高国农业流域，评估了河流中总磷（TP）浓度和负荷的时空变化。在流入湖水的地方还采样了一次风暴事件。陆上支流的最高中位数浓度为（0.064 mg 1-1），但最大值（0.614 mg 1-1）发生在暴风雨期间。湖面附近的水位较低，但夏季随深度增加。两条水流之间的差异很大，在一些地方，水的价值超过了水质标准。浓度的季节性不明显。流入期间的平均负荷和中位数分别约为7000和680 g第1天，而在暴风雨期间，最大值为81 540 g第1天。在天气调查期间，湖泊中的总磷负荷为470 g day-1或13 g km-2day-1。集水区的下半部分为该湖贡献了72％的负荷。底流，融雪和一场风暴分别占全年总流量的47％，30％和23％。
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